Shock-absorber.



MUGLELLAN C. PULLENLOVE. SHOCK ABSGEBER.

APPLIGATION NLBD MAY z2, 191.2.

Egm, y Patented July 29, i913.

2 SHEETS-SHEET 24 .tain new anduseul Improvements in Shock-M f @MMDernrnsringnnr herrn snoer: nesonnnn conrnnv;

` GOR-PDEATIGN 0F AEIZNA..

SHOCK-.ABSR'EER idl,

Application filed ll'a 'To ZZ whom it may concern:

`Be it known that I, MCCLELLAN FUL- LnNLovn, citizen of the UnitedStates, residing at Louisville, in the county of Jefferson 'and State ofKentucky, have invented cer Absorbers, of which the following is a speciication. v

My invention relates to new and useful improvement-s `in shock absorbers-for vevhicles, and the object of my invention is to provide a devicewhich may be applied to a vehiclein additionto the ordinary springs andwhich will permit they free Working of the springs under normalconditions, but which will take up thestra'm under abnormal conditionsand'limit extreme 'distortion of the springs and conse uently preventundue movement of theve nele body.`

A further object of my invention is to provide a shock absorber whichmay be applied to vehicles of all types, butwhich is particularlyapplicable to motor vehicles.

A further object ofmy invention is toprovide a 'shock absorber in whichthe required resistance is obtained by the friction betweeninterengaging threads of a plurality of telescopic members. And a stillfurther object of my invention is to provide a novel means for mountingmy shock absorber upon the vehicle in-,sucha manner' that te telescopicAmembers are lat all 'times maintained lin alinement with eachother.

With these and other objects in view, my v`invention will be more lullydescribed, illustrated in the accompanying drawings, and thenspeciiically pointed out in the'fclaims which -are attachedto and form apart of this application; v

in the drawings: Figure l is aside elevation of my improved shockabsorber, showing one way of attaching lthe same to a- 'vehiclegftheaxle of which is shown in section;

Fig. 2' isla `rear elevation, showing another way of 'attaching theshock absorber; Fig.

, 3. shows a still. further way of applying Vthe ilevioefig 4 is anelevation partially in kisection,shovring the structure of the .shockabsorbe1-gii`ig.` 5 is a transverse section on the line V5 5 ofFig. 4; 6Vis anV elevation partially in` sect-ion of a modied form of shockabsorber; Fig; 7 is atrans'verse sectionon the line -f-T of Fig. 6. y

`Corresponding and like parts ar e referred if. i@ eine renewingdescription am;

' petlcation of Letters .latent. i'

ratei-area nn-y ne, tere.

y 22, me. .serial no. essere;

cated in all the views of the drawings by the same referenceoharacte'irs.

The preferred embodiment of my shock absorber includes an internallythreaded member secured to theaxle, either directly or indirectlythrough the medium of a springend an externally threaded membertelescopically engaging with Vthe iirst inemloer and free to turn in thesame and having a swiveled connection with the vehicle spring or withthe body of the vehicle: The first of these members includes acylindrical casing 10, formed of any preferred metal closed at its lowerend and provided at its upper end with a removable closure ll includingin-its construction a sailing bon V12. Thebody 10 is internallythreaded, as shown at 13.,.for. engagement with the threads lll: of thesecond member 15, which member,` in this case, consists of a cylindricalbody member o' metal fitting Within the member 10 and threaded forIengagement with said member. The cylindrical member 15 is provided`with a central, longitudinally extending bore, through which is .passedone end of a shaft ,16, the bore and sha-:ft being so proportioned as topermit the member l5 to revolvefreely upon the shaft, said member beingheld against disengagement from the shaft by collars i? and 18 mountedupon the shaft one above and one below the cylindricalmem'bei 15. Thefree end of the shaft lois passed throughthe stuihg box l2 and theclosure 'll and is ivotally connected to che endet a bar i9, tiie otherend of which is secured to the spring of the vehicle or to the'body ofthe vehicleitseli,` as the case may be.; the closed lower'end of thebody I member. l0 is ,provided with. spacedv apart, downwardly directed,.perforated ears 20 95 adaptedjto receive a ;p1vot,pin El for pivotalattachment to one end` of a bar 232, theother end ofi which isl.preferably `secured to a spring 23 carried by the vehicle unie.'

As will be readily apparent any normal movement of the body oit' .thevehicle with respect to the running gear will be per mitted 4-vvithouthindrance by the shock absorber above described. in` case et anyabnormal movement, causedby exceptionally .3105 rough roads or the like,the resultant Inoveinent of the springs would natnraliy be muchmore-rapidfthan the` movement oi the ber iand the member l@ which.movement is retarded bythe irictional engagement oi the threads 13 and14. The members 10 and 15 will therefore serve as a cheek or brake tolimit both the downward and upward movement of the body of the vehicleand so absorb all unusual shocks.

If desired, the collar 17 may be omitted when the shock absorber willhave no effect upon the downward movement of the body of the vehicle,but will still act to cushion and limit its rebound or upward movement.Because of the pivotal connections between the body members of the shockabsorber and the bars 19 and 22, by which it. is mounted upon thevehicle, the members 10 and 15 are consequently held in alinement Witheach other and the frictional engagement between the two is thereforepractically constant.

It will of course be apparent that the strength or stiffness of theshock absorber depends upon the size and pitch of the intercngagingthreads, and that it is therefore a simple matter to construct shockabsorbers which will offer any desired resistance.

In F ig. 3 of the drawings, I have illustrated a somewhat modified formof construction in which the body member 10 is secured intermediate itslength directly to the axle of the vehicle and in which the free end ofthe shaft 16 is secured directly to the upper member 24 of the doubleelliptic spring 25. This form is particularly applicable to lightvehicles and particularly to those classes of vehicles drawn by horses.

In Fig. (3, I have shown a still further modified form of constructionincluding a relatively short cylindrical member 26 provided with aninternally threaded bore 27 through which extends the externallythreaded shaft 28. In-this form of consti-u1 tion the cylindrical member2G is mounted in a housing which is secured to the axle, while the upperend of theshaft 2Q is: swivelly connected to a head 29 which is securedto the spring. The shaft 28, as shown, passes completely through thecylindrical member 2G.

From the foregoing description, it will be apparent that I have providedan extremely simple and effective form of shock absorber and one whichmay be readily, applied to any type of vehicle. It will further beapparent thatthe resistance offered by the shock absorber againstmovement is directly proportional to the speed andextent of the movementagainst which the shock absorber is acted, thus giving a variable nallythreaded cylindrical body member, an

externally threaded body member-'movable within the .first and with itsthreads in engagement with the threads of the body member tofrictionally oppose movement of one member with respect to the other,said second member being provided with a central longitudinal bore, ashaft extending through the bore and free to turn therein, collarscarried by the shaft and bearing against the ends of the second memberto prevent. its longitudinal movement upon the shaft, means for securingthe body member to the running gear of a vehicle, and means for securingthe free end of the shaft to the body of the vehicle.

2. A shock absorber including a cylindrical body member closed at itslower end and internally threaded, a'second cylindrical memberexternally threaded to engage with the threads of the first member, ashaft extending longitudinally through the second member and free torotate therein, means for preventing longitudinal movement of the shaftto said second member, a. closure including a stuffing box for the rstmember, the free entl of the shaft passing through said closuret a barpivotally connected to the free end of the shaft by one end and adaptedfor pivotal connection to the body of a vehicle by its other, a springadapted for. attachment to the axle of a vehicle, and a bar rigidlysecured by one end to the spring and pivotally secured by its other endto the closed end of the body member.

3. A shock absorber including an internally threaded body member, anexternally threaded body member movable Within the lirst and with itsthreads inengagement with the threads ot' the first to frictionallyoppose movement of one member with respect to the other, said secondmember being provided with an axially extending bore, va shaft extendingthrough the -bore and free to turn therein, a collar'carried by thelower end of the shaft and bearing against the lower end of the secondme ber, means for securing the, first member th the running gear of avehicle, and means for securing the freed-end of the shaft to the bodyof the vehicle.A

et. A shock absorber including a. spring adapted for attachment to therunning` gear of a vehicle, a bracket adapted for attachment to the bodyof a vehicle, an internally threaded body member pivotally connected tothe free end of the spring. an externally threaded member telescopicallymounted in the body member with the threads of one engaging with thethreads of the other, and

.operative connecting means between the externally threaded member andthe bracket.

5. A shock absorber including a spring adapted for attachment by one endto the running gear of a vehicle, an internally threaded cylindricalcasing pivoted by one end to the free end of the spring, an externallythreaded member movable in the In testimony whereof I affix my Signaturec lindr ardf engagilng with the thread in Vpresence of two Witnesses.,A

t lereo a s a t swve ly connected with sai externally threaded member,and a bracket MQCLELLAN G' ULLENLOVE' [1 5'1 c pvotully connected to thefreev end of the Witnesses:

shaft und adapted for attachment to the BENJ. F. GARDNER,

body of .a vehicle. V CAMLLE L. DETERT.

